Process for production of silicon

C - Chemistry – Metallurgy – 01 – B

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C01B 33/021 (2006.01)

Patent

CA 2461014

A process for production of Si, characterized by adding an oxide, hydroxide, carbonate or fluoride of an alkali metal element, or an oxide, hydroxide, carbonate or fluoride of an alkaline earth metal element, or two or more of such compounds, to solid SiO in a total molar amount of from 1/20 to 1000 times with respect to the moles of solid SiO, heating the mixture at between the melting point of Si and 2000°C to induce a chemical reaction which produces Si and separating and recovering the Si from the reaction by-product, for the purpose of inexpensively and efficiently producing Si from various forms of solid SiO with no industrial value produced from Si production steps and the like.

L'invention concerne un procédé de production de silicium, Si, qui consiste à ajouter à un solide SiO, un oxyde, un hydroxyde, un carbonate ou un fluorure d'un élément métallique alcalino-terreux, ou au moins deux des composés susmentionnés en quantité molaire totale de 1/20 à 1000 fois celle du solide SiO pour préparer un mélange, à chauffer ce mélange à une température allant du point de fusion de Si jusqu'à 2000 DEG C, de façon à réaliser une réaction pour former Si, et à séparer le Si résultant des produits de réaction secondaires aux fins de sa récupération. Le procédé peut être utilisé pour produire Si à faible coût et avec un bon rendement, à partir de solides SiO sous diverses formes qui se produisent dans un processus de production de Si et analogue et n'ayant conventionnellement aucune valeur industrielle.

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